METHOD FOR PREPARING HIGH-CONTENT MIXED TOCOPHEROLS THROUGH LYOTROPIC LIQUID CRYSTAL EXTRACTION AND SEPARATION

摘要

A method for preparing high-content mixed tocopherols through lyotropic liquid crystal extraction and separation, comprising the following steps: dissolving vegetable oil deodorized distillate which is esterified or is subjected to fatty acid removal in a weak-polar organic solvent to prepare a feed solution; mixing ionic liquid or a surfactant with a polar diluent to prepare lyotropic liquid crystals; and separating and purifying the feed solution through countercurrent extraction or fractional extraction by taking the lyotropic liquid crystals as an extraction agent, thus obtaining mixed tocopherols. A lyotropic liquid crystal extraction agent in the present application has high extraction capacity on tocopherols, and the dosage of the extraction agent and the number of theoretical plates required for extraction can be obviously reduced; the lyotropic liquid crystal extraction agent which is adopted still can keep high extraction efficiency and selectivity under a higher feed concentration, the mixed tocopherols of which the purity is larger than 90% can be obtained, and the recovery rate of the mixed tocopherols is more than 90%.